155283217 has 2 divisors, whose sum is σ = 155283218. Its totient is φ = 155283216.

The previous prime is 155283187. The next prime is 155283223. The reversal of 155283217 is 712382551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86044176 + 69239041 = 9276^2 + 8321^2 .

It is an emirp because it is prime and its reverse (712382551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155283217 - 2¹¹ = 155281169 is a prime.

It is a super-2 number, since 2×155283217² = 48225754963738178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155283917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77641608 + 77641609.

It is an arithmetic number, because the mean of its divisors is an integer number (77641609).

Almost surely, 2^155283217 is an apocalyptic number.

It is an amenable number.

155283217 is a deficient number, since it is larger than the sum of its proper divisors (1).

155283217 is an equidigital number, since it uses as much as digits as its factorization.

155283217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 34.

The square root of 155283217 is about 12461.2686753797. The cubic root of 155283217 is about 537.4955090304.

The spelling of 155283217 in words is "one hundred fifty-five million, two hundred eighty-three thousand, two hundred seventeen".